Telephone-receiver.



No. 697,999; Patented nec. 3, |9'ol. H. LIEBElcH.

TELEPHONE RECEIVER.

(Application med Nov. 80, 1900.)

(No Model.)

@59 www* UNrrEiu STATES PArENr OFFICE.

HANS LIEBREICH, on DETROIT, MIcHieAN.

TELEPHONEw- RECEIl/ER.

SPECIFICATION forming party of Letters Patent No. 687,999, dated December 3, 1901- Applioation filed November 30, 1900. Serial No. 88,198. (No'model.)

To a/ZZ whom t may concern:

Beit known than, HANS LmBRErei-i, a citieen of the United States, residing at Detroit, 1n the county of Wayne and State of Michigan, haveA invented certain new and useful Improvements in Telephone-Receivers; and I do hereby declare the followingto be afull clear, and exactdescription of the invention,

`such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in telephone-receivers; and it consists in a receiver having a suitable casing, diaphragms inclosed within the same, a magnet adapted to act upon the diaphragm, adj ustable'means for regulating the strength of the magnet,

and means for connecting the instrument with a telephone-line whereby the diaphragm may be caused to vibrate in response to impulses received from the same.

It also consists in a telephone-receiveremploying-diaphragms, a magnet for operating upon the same, adjustable leaves or plates secured to the agnet whereby the strength of the same ma .be altered, and coils carried by the poles of the magnet and adapted to be -yation.

connected with a telephone-line, whereby impulses received over the same may cause the vibration of the diaphragm for' the reproduction of sounds or signals.

It also consists in certain other novel constructions, combinations, and arrangements of parts, as will be hereinafter more fully described and specifically claimed.

In the accompanying drawings, Figure 1 is a side elevation of my improved receiver. Fig. 2 is a longitudinal cross-section through the same. Fig. 3 is a-transverse cross-section' through the receiver to one side ofthe magnet, the magnet being shown in side ele- Fig. 4 is a side elevation of a magnet made in a little different shape from' that shownin Fig. 3. Y

The receiver forming the subject of the presentrinvention is so made as to be capable 4 `of use in connection with ordinary telephone systems and is particularly well adapted for reproducing sounds or impulses received from a line employing a transformer for increasing the efficiency thereof.

The receiver is provided with a suitable casing made up of a series of rings, the outer rings 1 1, 2 2, and 3 inclosing the apparatus within the receiver. Suitable diaphragme of thin vibrant material, as 4 4, are secured in the rings 1 1 by means of clamping-rings 5 5. The ringsA 2 2 are intermediate ones connecting the rings 1 1 and the ring 3 andare provided with screw-threads upon their inner and outer surfaces for this purpose, which engage threads upon the outer surface of the ring 3 and upon the inner surface of the rings 1 1. By turning the rings 2 `2 the'distance between the rings 1 1 and the ring 3 can be varied and the distance between4 the diaphragm 4 4 can be regulated. The peripheries of the rings 2 2 are'preferably provided with serrated portions, so that the said rings may be more easily turned when' graspedby.

the hand. Cap-pieces 6 6, of ordinary construction, are preferably applied outside the diaphragms 44 and are formed with the usual perforationsfor the emission of sound-waves -from the receiver.

Within the ring 3 and secured thereto is a suitable magnet, as 7, whichmay be made in various forms. A good form in which to make the said magnet is illustrated in Fig. 3 of the drawings, in which it is given an approximately S shape, the pole ends being bent inwardly so as to come opposite the central axis of the receiver. The said magnet is preferably secured to the ring 3 by means of screws or bolts 8 8, which may be adjusted from the outside of the receiver.

to each side'thereof segmental plates 9 9, which are preferably secured at one end, as at 10, tothe magnet, While the ,other` end of eachsegment is free. I contemplate employ- .ing set-screws, as 11 11, which engage screwthreaded apertures in the plates 9 9 and bear -at their inner ends upon themagnet 7 for adjusting the said plates to different distances from the magnet 7. By this structure I ind that the strength of the magnet may be regulated as desired, it merelybeing necessary to spring theplates out to the proper distance from the magnet by means of the set-screws .1l to produce the said variation.

'.lhe mag-` nt is strengthened by permitting the plates to lie close to the magnetand is weakened by springing the plates away from the magnet.

In order lto vary thel strength of the magnet 7, I secure IOO ` The poles ofthe magnet, which'are .turned in'- whichare preferably screwed into the ends wardly, are provided with pole-pieces 12 12,

of the magnet upon each side thereof. These pole-pieces are slotted 'or kerfed, .as at 13 13, vto make it possible to demagnetize and magnetize them more quickly.. The pole-pieces 1 are surrounded by coils of wire,` as 14 "14,

which are connected with each other by suitable wires and are adapted to beconnected up with the'linewire of the telephone, so that impulses received over the same will vary the magnetic power of the'pole-pieces. The

.pole-'pieces are arranged so that 'their ends are in close proximity to theinner surfacesof the diaphragms 4 4 and so that the said diaphragms are acted upon at'more than one point. By this construction when 'waves or impulses are received over the lincwire the diaphragms will be vibrated in ya series of 5 waves for the better reproducing of sounds or signals.

I find in practicevthat it is preferable to cause the `diaphragms 4 4 to actin unison, and for this purpose I connect the two by 4ljusting nut or nipple, as 16. The ends of the vcatgut are passed through lthe nipples 1 6 16 and knotted outside the same. By turning be regulated. The catgut preferably passes through an aperture '17, formed in the magnet 7, so that its action upon the diaphragms is not interfered with by any of the mechan' ism within the receiver. By thus connecting the diaphragms,which are polarized, both of them are forced to vibrate simultaneously to the same extent', and their effect is collective; and practically doubled, so thatthe power of,v

the receiver is materially improved by this construction. v

Instead of making the magnet in an S shape, as seen in Fig. 3, it may bemade si'inply inthe form of a horseshoe-magnet, as illustrated at 18 in Fig. 4. In this instance the ends of the magnet are turned inwardly in the same manner as before and carry polepieces 1,9 19, which are surrounded by coils 2O 20. These coils are-.connected with the line-wire, as heretofore described with respect to the coils 14. Segmental plates 21 2l are secured to'eachv sideof the horseshoemagnet 18 by screws 22,' while set-screws 23 23 are employed for regulating the dist-ance of the plates from the magnet proper,'and

therebyvarying its power. It will beappar-v ent that other minor details of construction may be varied without departing inthe least fromthe spirit of .the invention.

Having now described my invention, what I claim, and desire to secure byLetters Pat# 1. A receiver for telephones comprisingdia-4 phragms suitably supported in` position, a magnet interposed between the samel and acting upon both of them, and adjustable means secured to the magnet for .varying the strength of the same, substantially'T as described. t

2. A receiver for telephones comprising a casing, diaphragms mounted therein, a magnet-arranged to act upon the diaphragms, means for' varying the strength of the magnet comprising segmental adjustable plates mounted on each side of, themagnet, means for adjusting the said plates at dierent dis-` tances from the said lmagnet, substantially as described.

3. In atelephone-receiver, the combination with vibrating diaphragms, of a magnet'for acting upon the same, plates or leaves se,-

cured at one of their -ends to the magnet,

while the other ends are'free, `and'set-screws carried by the saidleaves adapted to bear upon the sides of the magnet for varying the distance of theplates from the magnet to alter its strength, substantially as described',

A4. In a telephone-receiver, thecombination vwith a casing, of diaphragms mounted there-- in, .a magnet interposed' between the da phragm pole-pieces carried by thesaid magnet, coils'surrounding the pole-'pieces and coni nected with the telephone-line, and adjustable plates adjustably secured to each side of the magnet so thatthey may be held at .greater o r less distances'therefromfor Vary- -ingits strength, substantially as described. the nipples l1G the tension of the catgut ma'y.

'5. .A telephone-receiver comprising a casing made up of a series of rings, two ofsaid 'loo and engaging screw-threads upon the same,"

whereby upon turning the said ringstherela-4 tive positions of all the rings may be modil fied, diaphragms. mounted in the outer rings, .a magnet mounted in the inner ring, and means for varying the strength ofthe magnet, substantiallyas described; 6. A telephone-receiver comprising a cas'- ing, diaphragmsmounted therein in planes I-IO parallel v'to each other, means for connecting the said diaphragms so that they will vibrate inun'ison, a horseshoe-magnet mounted between the diaphragms having its free ends bent inwardly toward the centerof the reeach other, adjustable means connecting the dia phragms co'mprisin g a cord passed through apertures inV` the diaphragm, adjusting-nip-v ples engaging the said apertures and-secured to the cord, whereb5T the tension thereof may vbe varied, and a magnet interposed between the diaphragms and provided with polepieces for attracting bothy of them, coils surrounding said pole-pieces and connected with `ceiver, pole-pieces carrie 'by the magnet and a telephone-line for producing vibrations upon the diaphragms, substantially as described.

8. A telephone-receiver comprising a casing, diaphragms mounted therein, an S- shaped magnet mounted between the diaphragms, set-screws for holding the magnet in position in the casing and means for varying the strength of the magnet comprising plates o1' leaves adapted to be adjusted to different distances from the sides of the magnet to Vary its strength, substantially as described.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

HANS LIEBREICI-I.

Witnesses:

J OHN L. FLETCHER, CAssELL SEVERANCE. 

